Biomechanical front traction reverse combination appliance and manufacturing method thereof
By using a biomechanical anterior traction reverse occlusion appliance, utilizing the maxillary impedance center and traction indicator structure, combined with a digital model, the problems of traction direction error and low posterior tooth movement efficiency in bracketless clear aligners have been solved, achieving precise maxillary bone movement and improved patient comfort.
Patent Information
- Application Number
- CN202511774079.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-02-24
AI Technical Summary
In existing bracketless clear aligners, the traction direction in maxillary anterior traction treatment relies on the doctor's intuition, which is prone to error, and the design of the posterior occlusal pad affects the efficiency of tooth movement.
A biomechanical anterior traction reverse occlusion appliance was designed, which adds a personalized traction structure and traction indicator structure by the center position of the maxillary impedance, and combines the digital three-dimensional model of the oral cavity to clarify the traction direction, and is manufactured using technologies such as 3D printing.
It improves the precision and efficiency of maxillary bone movement, and the anterior and posterior teeth are quickly aligned while the front traction is applied, increasing patient comfort and treatment efficiency.
Smart Images
Figure CN121549943A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of orthodontic technology, and in particular to a biomechanical anterior traction reverse occlusion appliance and its manufacturing method. Background Technology
[0002] Class III malocclusion has a higher incidence rate in East Asian populations than in Western populations, with 42%–63% of cases being skeletal Class III malocclusion. For skeletal Class III malocclusion caused by maxillary hypoplasia, orthodontic treatment using maxillary anterior traction appliances during the peak of puberty has good results.
[0003] Traditional maxillary anterior traction appliances are intraoral pad-type appliances. However, with the emergence and increasing market popularity of clear aligners, the demand for maxillary traction using clear aligners is growing. Currently, the strategy for anterior traction treatment with clear aligners involves either first using a traditional intraoral pad-type appliance followed by clear aligner treatment, or designing traction clips on the clear aligner for anterior traction. However, because current clear aligners are primarily designed to align with the gingival margin, the traction clips can only be positioned within the crown height range, which somewhat limits the traction direction.
[0004] The direction of maxillary movement during maxillary anterior traction depends on the direction of the traction and the point of application of force. When the force line passes through the center of resistance of the maxillary complex, the maxilla can be moved forward nearly horizontally. When the force line passes above or below the maxillary complex, the maxilla rotates counterclockwise / clockwise. Therefore, the mode of maxillary movement and the force line are related to the center of resistance of the maxillary complex, but currently, clinical practice mainly relies on the doctor's intuition, which introduces a certain degree of error.
[0005] In addition, existing anterior traction appliances have a posterior tooth occlusal pad, but because the posterior tooth occlusal pad completely wraps around the posterior teeth, it is difficult for the posterior teeth to move while anterior traction is being applied, which affects the efficiency of tooth movement. Summary of the Invention
[0006] To overcome the above deficiencies, this invention aims to provide a biomechanical anterior traction reverse occlusion appliance that adds personalized traction structure position and anterior traction direction indication by adjusting the position of the maxillary impedance center. This facilitates doctors in clinical practice to formulate reasonable traction directions based on the different vertical bone facial features of patients, thereby improving clinical treatment efficiency.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A biomechanical anterior traction orthodontic appliance includes a maxillary anterior traction appliance body, wherein a traction indicator structure is provided between the maxillary bone impedance center of the maxillary anterior traction appliance body and the traction point of the anterior traction structure on the surface of the appliance.
[0009] Preferably, the traction indicator structure is a connecting line mark, which is a protrusion or depression located on the surface of the maxillary anterior traction orthodontic appliance.
[0010] Preferably, the position of the traction indicator structure is determined by a digital three-dimensional model of the oral cavity. The digital model of the oral cavity is constructed by the patient's oral cavity scan data and CBCT data. The oral cavity scan data and CBCT data include information on the patient's tooth crowns, tooth roots, and jawbones. The method for determining the maxillary impedance center is to directly align the maxillary molars and second premolars with the level of the maxillary piriform foramen.
[0011] Preferably, the maxillary anterior traction appliance body is manufactured as a single unit, and the maxillary anterior traction appliance body includes a maxillary dentition enclosure and retention structure, a palatal support and functional stimulation structure for the maxillary anterior teeth region, an anterior traction structure on the appliance surface, a posterior occlusal pad structure, and a transpalatal bar structure.
[0012] More preferably, the maxillary dentition enclosure and retention structure includes an enclosure portion and a retention portion;
[0013] The wrapping portion wraps around the entire maxillary dentition, with its end extending to the distal part of the molars. The inner wall of the wrapping portion is in contact with the outer wall of the maxillary dentition, and the edge of the wrapping portion is level with the gingival margin or extends to the gingiva.
[0014] The retention portion includes an undercut retention structure adapted to the tooth, a posterior attachment holding structure adapted to the posterior tooth portion, and a retention structure convex to the tooth surface.
[0015] Preferably, the palatal support and functional stimulation structure of the maxillary anterior region includes a fold wall on the inner side of the maxillary anterior traction appliance body that fits against the palatal side of the maxillary anterior region, the fold wall extending from the lingual gingival margin of the maxillary anterior region to the anterior palate.
[0016] Preferably, the wrinkled wall is a thickened solid structure.
[0017] Preferably, the anterior traction structure on the surface of the orthodontic appliance is located in the area excluding the maxillary canine region before the first maxillary premolar. The anterior traction structure on the surface of the orthodontic appliance is a self-extension structure with a top cap, a self-extension structure with a top question mark hook, a self-extension structure with multiple alveoli, or a button-shaped or cap-shaped structure directly located on the outer surface of the orthodontic appliance.
[0018] Preferably, the posterior occlusal pad structure includes a protruding structure located on the occlusal surface of the posterior tooth region.
[0019] Preferably, the transpalatal bar structure includes an elastic structure located on the lateral side of the palate of the maxillary anterior traction appliance body, connecting the opposing posterior teeth.
[0020] This aspect also discloses the aforementioned
[0021] The preparation method of a biomechanical anterior traction reverse occlusion appliance includes the following steps:
[0022] S1. Obtaining a digital model: Obtaining a digital model of the patient's dentition and the lingual mucosa area of the mandible through oral scan data;
[0023] S2. Obtain patient imaging data: Obtain three-dimensional models of the patient's maxilla, mandible, and upper and lower dentition through the patient's CBCT data;
[0024] S3. Three-dimensional reconstruction based on patient imaging model and intraoral scan model: Import the patient's maxilla, mandible and crown CBCT data into the three-dimensional reconstruction software, replace the upper and lower crown models with the digital model, and match the orthodontic appliance into the three-dimensional reconstruction model;
[0025] S4. Calculation of the virtual rotation center of the maxilla and mandible: The method for determining the maxillary impedance center is to directly align the maxillary molar and the second premolar with the horizontal level of the piriform foramen of the maxilla. The maxillary impedance center is the virtual rotation center of the maxilla and mandible.
[0026] S5. Construction of the indicator structure: Connect the virtual rotation center of the upper and lower jaws with the traction structure of the orthodontic appliance, and use the projection of the connecting line on the orthodontic appliance as the basis for constructing the traction indicator structure.
[0027] S6. Construction of traction indicator structure: The indicator structure of the orthodontic appliance is constructed as a groove or protrusion on the surface of the orthodontic appliance;
[0028] S7. Construction of traction direction indicator structure: The traction direction indicator structure is constructed as a groove or protrusion on the surface of the orthodontic appliance;
[0029] S8. Processing and manufacturing: Import the final digital model file obtained after step S7 into the production equipment, and process it through molding or 3D printing to obtain the biomechanical anterior traction reversed compensator.
[0030] The beneficial effects of this invention are as follows:
[0031] 1. The present invention provides a visual reference for the direction of maxillary anterior traction: The present invention can individually mark the line connecting the patient's maxillary bone impedance center and the anterior traction device, which makes it easier for doctors to formulate a reasonable traction direction in clinical practice based on the patient's different vertical bone surface type.
[0032] 2. This invention can improve clinical treatment efficiency, specifically in the following ways:
[0033] ① Simultaneously pull forward and quickly align the front teeth.
[0034] ② Anterior traction is used to quickly align the posterior teeth, which is achieved through stress-dispersing connecting occlusal pads in the posterior tooth region.
[0035] ③ Elastic transverse palatal bar structure: It is beneficial for patients to expand their palate quickly while undergoing anterior traction.
[0036] 3. This invention features a bracketless structure, which increases patient comfort. Attached Figure Description
[0037] Figure 1 This is a panoramic schematic diagram of the biomechanical anterior traction reverse occlusion device disclosed in this invention.
[0038] Figure 2 This is a rear view of the biomechanical anterior traction reverse occlusion device disclosed in this invention.
[0039] Figure 3 This is a front view of the biomechanical anterior traction reverse occlusion device disclosed in this invention.
[0040] Figure 4 This is a top view of the biomechanical anterior traction reverse occlusion device disclosed in this invention.
[0041] Figure 5 This is a schematic diagram of wearing the biomechanical anterior traction reverse occlusion device disclosed in this invention.
[0042] Figure 6 This is a schematic diagram of the method in Example 2.
[0043] Figure 7 A is a schematic diagram of the traction direction in Example 3.
[0044] Figure 7 B is a schematic diagram of the patient's teeth before treatment in Example 3.
[0045] Figure 7 C is a schematic diagram of the patient's teeth after treatment in Example 3.
[0046] Figure 8 A is a schematic diagram of the traction direction in Example 4.
[0047] Figure 8 B is a schematic diagram of the patient's teeth before treatment in Example 4.
[0048] Figure 8 C is a schematic diagram of the patient's teeth after treatment in Example 4.
[0049] Figure 9 A is a schematic diagram of the traction direction in Example 5.
[0050] Figure 9 B is a schematic diagram of the patient's teeth before treatment in Example 5.
[0051] Figure 9 C is a schematic diagram of the patient's teeth after treatment in Example 5. Detailed Implementation
[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings.
[0053] Example 1
[0054] like Figures 1-4 As shown, this embodiment discloses a biomechanical anterior traction orthodontic appliance, including a maxillary anterior traction appliance body, which is integrally manufactured. The maxillary anterior traction appliance body includes a maxillary dentition enclosure and retention structure 1, a palatal support and functional stimulation structure for the maxillary anterior teeth region 2, anterior traction structure on the appliance surface 3, a posterior occlusal pad structure 5, and a transpalatal bar structure 6. A connecting line 4 is provided between the maxillary bone resistance center of the maxillary anterior traction appliance body and the traction point of the anterior traction structure on the appliance surface, wherein:
[0055] Line marker 4 is a protrusion or depression located on the surface of the maxillary anterior traction appliance. It indicates the line connecting the resistance center and the traction device, allowing the dentist to determine the direction of jaw rotation after traction based on the position and direction of the traction elastic band and this indicator line, thus achieving good vertical control. The position of line marker 4 is determined using a digital 3D model of the oral cavity. This model is constructed using the patient's oral scan data and CBCT data, which include information on the patient's tooth crowns, roots, and jawbone. The method for determining the maxillary resistance center is to directly align the maxillary molars and second premolars with the level of the piriform foramen.
[0056] The maxillary dentition enclosure and retention structure 1 includes an enclosure portion and a retention portion. The enclosure portion encloses the entire maxillary dentition and extends distally to the molars. The inner wall of the enclosure portion conforms to the outer wall of the maxillary dentition, and the enclosure margin can be either at the gingival margin or extending to the gingiva. The retention portion includes retention structures for the appliance and tooth undercuts, clasping structures for the posterior teeth of the appliance and posterior tooth attachments, and retention structures protruding from the inner surface of the appliance onto the tooth surface.
[0057] The palatal support and functional stimulation structure 2 in the maxillary anterior region includes: a folded wall that fits against the palatal side of the maxillary anterior region through the inner wall of the orthodontic appliance. This folded wall, through a solid structure with increased thickness or other structural designs, aims to increase the anchorage of the anterior teeth in the palatal region and functionally stimulate maxillary bone growth. The folded wall extends from the lingual gingival margin of the maxillary anterior region to the anterior palate.
[0058] The third traction structure on the surface of the orthodontic appliance is a traction structure extending from the outer surface of the appliance towards the root of the maxillary anterior teeth in the anterior region. Its location, besides being in the traditional maxillary canine region, can be anywhere before the first maxillary premolar and can be adjusted according to the clinician's needs and the patient's comfort. The morphology of this traction structure can be a self-aligned appliance extension with a top cap structure, a self-aligned appliance extension with a top question mark-shaped hook structure, a self-aligned appliance connecting extension with a multi-alveolar structure, or a button-like or cap-like structure directly located on the outer surface of the appliance.
[0059] The posterior occlusal pad structure 5 is a protruding structure located on the occlusal surface of the posterior teeth region. Variations of the posterior occlusal pad structure 5 include: i. Traditional occlusal pad: characterized by a protruding structure on the occlusal surface of the posterior teeth region. Its occlusal surface can be smooth or exhibit horizontal lines, diamond patterns, or form an anatomical occlusal contact with the opposing teeth. ii. Modified occlusal pad: can be used to simultaneously align posterior teeth. Each tooth in the posterior teeth region forms an independent protruding structure on the occlusal surface through an extension structure on the occlusal surface. Its occlusal surface can be smooth or exhibit horizontal lines, diamond patterns, or form an anatomical occlusal contact with the opposing teeth.
[0060] The transpalatal bar structure 6 is an elastic structure located on the lateral side of the palate of the orthodontic appliance, connecting the opposing posterior teeth. This structure can connect two or more posterior teeth on both sides to achieve arch expansion in patients with insufficient maxillary width. This structure matches the curvature of the patient's maxillary palate to achieve good patient comfort.
[0061] This embodiment facilitates maxillary anterior traction treatment by incorporating mechanical structures in specific areas of the clear aligner. These structures include a schematic diagram of the maxillary impedance center force line, personalized traction hooks, and a split posterior occlusal pad structure. This allows dentists to achieve personalized, comfortable, and efficient maxillary anterior traction treatment based on the patient's different vertical skeletal profiles. The aforementioned mechanical structures can be manufactured using methods such as 3D printing, casting, thermoforming, and injection molding.
[0062] like Figure 5 As shown, this embodiment uses a bracketless transparent material, which is comfortable and aesthetically pleasing to wear.
[0063] Example 2
[0064] Based on Example 1, this example discloses a method for preparing this biomechanical anterior traction reverse occlusion appliance, such as... Figure 6 As shown, the specific steps include the following:
[0065] S1. Obtaining a digital model: Obtaining a digital model of the patient's dentition and the lingual mucosa area of the mandible through oral scan data;
[0066] S2. Obtain patient imaging data: Obtain three-dimensional models of the patient's maxilla, mandible, and upper and lower dentition through the patient's CBCT data;
[0067] S3. Three-dimensional reconstruction based on patient imaging model and intraoral scan model: Import the patient's maxilla, mandible and crown CBCT data into the three-dimensional reconstruction software, replace the upper and lower crown models with the digital model, and match the orthodontic appliance into the three-dimensional reconstruction model;
[0068] S4. Calculation of the virtual rotation center of the maxilla and mandible: The method for determining the maxillary impedance center is to directly align the maxillary molar and the second premolar with the horizontal level of the piriform foramen of the maxilla. The maxillary impedance center is the virtual rotation center of the maxilla and mandible.
[0069] S5. Construction of the indicator structure: Connect the virtual rotation center of the upper and lower jaws with the traction structure of the orthodontic appliance, and use the projection of the connecting line on the orthodontic appliance as the basis for constructing the traction indicator structure.
[0070] S6. Construction of traction indicator structure: The indicator structure of the orthodontic appliance is constructed as a groove or protrusion on the surface of the orthodontic appliance;
[0071] S7. Construction of traction direction indicator structure: The traction direction indicator structure is constructed as a groove or protrusion on the surface of the orthodontic appliance;
[0072] S8. Processing and manufacturing: Import the final digital model file obtained after step S7 into the production equipment, and process it through molding or 3D printing to obtain the biomechanical anterior traction reversed compensator.
[0073] Example 3
[0074] Based on Example 1, this example discloses the first practical application of this biomechanical anterior traction reverse occlusion appliance, suitable for cases where the maxilla needs to be moved forward but not rotated, specifically as follows: Figure 7 A, Figure 7 B Figure 7 As shown in C, the traction direction 51 is along the line connecting the front traction structure 3 and the impedance center 50 on the surface of the orthodontic appliance, so that the maxillary movement direction 52 is forward movement.
[0075] Example 4
[0076] Based on Example 1, this example discloses a second practical application of this biomechanical anterior traction reverse occlusion appliance, suitable for cases where the maxilla needs to be moved forward and rotated clockwise, specifically as follows: Figure 8 A, Figure 8 B Figure 8As shown in C, the traction direction 51 passes through the anterior traction structure 3 on the surface of the orthodontic appliance and passes above the impedance center 50, so that the maxillary movement direction 52 is forward movement and the maxillary rotates in a clockwise direction 53.
[0077] Example 5
[0078] Based on Example 1, this example discloses a third practical application of this biomechanical anterior traction reverse occlusion appliance, suitable for cases where the maxilla needs to be moved forward and rotated counterclockwise, specifically as follows: Figure 9 A, Figure 9 B Figure 9 As shown in C, the traction direction 51 passes through the anterior traction structure 3 on the surface of the orthodontic appliance and passes below the impedance center 50, so that the maxillary movement direction 52 is forward movement and the maxillary rotates in the counterclockwise direction 54.
[0079] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.
Claims
1. A biomechanical anterior traction reverse occlusion appliance, comprising a maxillary anterior traction appliance body, characterized in that, A traction indicator structure is provided between the maxillary bone impedance center of the main body of the maxillary anterior traction appliance and the traction point of the anterior traction structure on the surface of the appliance.
2. The biomechanical anterior traction reverse occlusion device according to claim 2, characterized in that, The traction indicator structure is a connecting line mark, which is a protrusion or depression located on the surface of the maxillary anterior traction orthodontic appliance.
3. The biomechanical anterior traction reverse occlusion device according to claim 1 or 2, characterized in that, The position of the traction indicator structure is determined by a digital three-dimensional model of the oral cavity. The digital model of the oral cavity is constructed using the patient's oral cavity scan data and CBCT data. The oral cavity scan data and CBCT data include information on the patient's tooth crowns, roots, and jawbones. The method for determining the maxillary impedance center is to directly align the maxillary molars and second premolars with the level of the maxillary piriform foramen.
4. The biomechanical anterior traction reverse occlusion device according to claim 1 or 2, characterized in that, The maxillary anterior traction appliance is manufactured as a single unit, comprising a maxillary dentition enclosure and retention structure, a palatal support and functional stimulation structure for the maxillary anterior teeth region, an anterior traction structure on the appliance surface, a posterior occlusal pad structure, and a transpalatal bar structure.
5. The biomechanical anterior traction reverse occlusion device according to claim 4, characterized in that, The maxillary dentition enclosure and retention structure includes an enclosure portion and a retention portion; The wrapping portion wraps around the entire maxillary dentition, with its end extending to the distal part of the molars. The inner wall of the wrapping portion is in contact with the outer wall of the maxillary dentition, and the edge of the wrapping portion is level with the gingival margin or extends to the gingiva. The retention portion includes an undercut retention structure adapted to the tooth, a posterior attachment holding structure adapted to the posterior tooth portion, and a retention structure convex to the tooth surface.
6. The biomechanical anterior traction reverse occlusion device according to claim 4, characterized in that, The palatal support and functional stimulation structure of the maxillary anterior region includes a fold wall on the inner side of the maxillary anterior traction appliance that fits against the palatal side of the maxillary anterior region, the fold wall extending from the lingual gingival margin of the maxillary anterior region to the anterior palate.
7. The biomechanical anterior traction reverse occlusion appliance according to claim 6, characterized in that, The wrinkled walls are thickened solid structures.
8. The biomechanical anterior traction reverse occlusion device according to claim 4, characterized in that, The anterior traction structure on the surface of the orthodontic appliance is located in the area before the first premolar of the maxilla, excluding the area of the maxillary canines. The anterior traction structure on the surface of the orthodontic appliance can be a self-extension structure with a top cap, a self-extension structure with a top question mark hook, a self-extension structure with multiple alveolar grooves, or a button-shaped or cap-shaped structure directly located on the outer surface of the orthodontic appliance.
9. The biomechanical anterior traction reverse occlusion device according to claim 4, characterized in that, The posterior occlusal pad structure includes a protruding structure located on the occlusal surface of the posterior occlusal region.
10. The biomechanical anterior traction reverse occlusion device according to claim 4, characterized in that, The transpalatal bar structure includes an elastic structure located on the lateral side of the palate of the maxillary anterior traction appliance body, connecting the opposite posterior teeth.
11. A method for preparing the biomechanical anterior traction reverse occlusion device according to any one of claims 1-10, characterized in that, Includes the following steps: S1. Obtaining a digital model: Obtaining a digital model of the patient's dentition and the lingual mucosa area of the mandible through oral scan data; S2. Obtain patient imaging data: Obtain three-dimensional models of the patient's maxilla, mandible, and upper and lower dentition through the patient's CBCT data; S3. Three-dimensional reconstruction based on patient imaging model and intraoral scan model: Import the patient's maxilla, mandible and crown CBCT data into the three-dimensional reconstruction software, replace the upper and lower crown models with the digital model, and match the orthodontic appliance into the three-dimensional reconstruction model; S4. Calculation of the virtual rotation center of the maxilla and mandible: The method for determining the maxillary impedance center is to directly align the maxillary molar and the second premolar with the horizontal level of the piriform foramen of the maxilla. The maxillary impedance center is the virtual rotation center of the maxilla and mandible. S5. Construction of the indicator structure: Connect the virtual rotation center of the upper and lower jaws with the traction structure of the orthodontic appliance, and use the projection of the connecting line on the orthodontic appliance as the basis for constructing the traction indicator structure. S6. Construction of traction indicator structure: The indicator structure of the orthodontic appliance is constructed as a groove or protrusion on the surface of the orthodontic appliance; S7. Construction of traction direction indicator structure: The traction direction indicator structure is constructed as a groove or protrusion on the surface of the orthodontic appliance; S8. Processing and manufacturing: Import the final digital model file obtained after step S7 into the production equipment, and process it through molding or 3D printing to obtain the biomechanical anterior traction reversed compensator.